The minimum number of blocks in pairwise balanced designs with maximum block size 4: the final cases. - Martin Grüttmüller; Ian T. Roberts; Sue D'Arcy; Judith Egan (Australas. J Comb., 2006)

Completely separating systems of k-sets for (k-12) ≤ n < (k2) or 11 ≤ k ≤ 12. - Ian T. Roberts; Sue D'Arcy; Hans-Dietrich O. F. Gronau (Australas. J Comb., 2013)